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Journal articles on the topic 'Aqueous Alkaline'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Liu, C., J. Liu, Y. Rong, N. Liang, and L. Rong. "Aqueous extraction of limonin from Citrus reticulate Blanco." Czech Journal of Food Sciences 30, No. 4 (2012): 364–68. http://dx.doi.org/10.17221/108/2011-cjfs.

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The replacement of organic solutions in the extraction of limonin from citrus seeds with an alkaline solution was investigated. This method was based on the reversible conversion of limonin to limonoate A-ring lactone via ring-opening of D-ring lactone at different pH values. The extraction conditions, optimised using Taguchi experimental design, were as follows: pH 11, temperature 70&deg;C, alkaline solution/seeds ratio 20:1 (v/w), ultrasonic power 800 W for 30 minutes. A yield of 7.5 mg/g (limonin/citrus seeds) of 98% pure limonin was obtained. &nbsp;

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2

S., C. HIREMATH, A. CHIMATADAR S., and R. RAJU J. "Oxidation of Dimethylamine by Diperioclatonickelate( IV) in Aqueous Alkaline Medium." Journal of Indian Chemical Society Vol. 72, Apr 1995 (1995): 253–56. https://doi.org/10.5281/zenodo.5902210.

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Department of Chemistry, Karnatak University. Dharwad-580 003 <em>Manuscript received 27 April 1993, revised 24 September 1993, accepted 2 December 1993</em> The title reaction is found to be first order in [DPN] (DPN, diperiodatonickelate(IV)) and fractional order both in [DMA] (DMA, diamethylamine) and [0H<sup>-</sup>]. Periodate causes retradation. Effects of added products, Jomc strength, dielectric constant and temperature on the oxidation kientics have been studied. MPN (monoperiodatonickelate(IV)) was found to be the active form of oxidant. A tentative mechanism with complex format

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3

North, Michael R., M. Alejandra Fleischer, and Thomas W. Swaddle. "Precipitation from alkaline aqueous aluminosilicate solutions." Canadian Journal of Chemistry 79, no. 1 (2001): 75–79. http://dx.doi.org/10.1139/v00-182.

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The longevity of metastable, highly alkaline Na and K aluminosilicate solutions has been examined over a wide range of Si/Al concentration ratios R (0.04 [Formula: see text] R [Formula: see text] 20) at 24°C and, in selected cases, at 50 and 75°C. In general, the longest solution lifetimes (tppt) (several weeks) were found at 24°C and for the highest alkalinities and (or) large R, but long tppt were also found for R = 1.0 at the lower alkalinities. Solution lifetimes generally shortened when the temperature was raised, but the opposite effect was observed with the smaller Al concentrations whe

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4

Bird, Robert W. "Aqueous alkaline cleaners: A better alternative." Metal Finishing 93, no. 3 (1995): 10–20. http://dx.doi.org/10.1016/0026-0576(95)93623-a.

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5

S., C. HIREMATH, A. CHIMATADAR S., and R. RAJU J. "Osmium(VIII)-catalysed Oxidation of Dimethylamine by Periodate in Aqueous Alkaline Medium." Journal of Indian Chemical Society Vol. 73, Jun 1996 (1996): 279–81. https://doi.org/10.5281/zenodo.5897683.

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Department of Chemistry, Arts and Science College, Jamkhandi Department of Chemistry, Karnatak University, Dharwad-580 003 <em>Manuscript received 9 February 1994, revised 9 August 1994, accepted 15 September 1994</em> Osmium(VIII)-catalysed Oxidation of Dimethylamine by Periodate in Aqueous Alkaline Medium.

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6

Guthrie, J. Peter, and John Cossar. "Alkaline cleavage of trihaloacetophenones." Canadian Journal of Chemistry 68, no. 9 (1990): 1640–42. http://dx.doi.org/10.1139/v90-255.

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Rate constants for haloform cleavage of trifluoro-, trichloro-, and tribromoacetophenone have been measured in aqueous solution; apparent second-order rate constants for reaction by the monoanion are in the ratio 1:5.3 × 1010:2.2 × 1013. Keywords: haloform cleavage, reactivity, trihalomethide leaving groups.

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7

Li, Dr Huan, and Dr Ling Zhao. "EFFECT OF ALKALINE CONDITIONS ON THE CATALYSIS AND KINETICS OF SODIUM BOROHYDRIDE HYDROLYSIS." International Journal of Research in Engineering 5, no. 3 (2025): 1–5. https://doi.org/10.55640/ijre-05-03-01.

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The hydrolysis of sodium borohydride (NaBH₄) is a significant reaction due to its potential applications in energy storage, fuel cells, and hydrogen production. This study investigates the kinetics of catalytic hydrolysis of sodium borohydride in both aqueous and aqueous-alkaline solutions. The reaction rates are measured under varying conditions of concentration, temperature, and pH to understand the impact of these variables on the overall rate of hydrogen production. Using a range of catalysts, including transition metal catalysts, the study also explores how the catalytic nature influences

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8

Nikonova, Natalya N., Tatyana V. Hurshkainen, Oksana G. Shevchenko, and Alexander V. Kuchin. "“Green technology” processing of pine (Pinus sylvestris L.) and larch (Larix sibirica Ledeb.) wood greenery to produce bioactive extracts." Holzforschung 76, no. 3 (2021): 276–84. http://dx.doi.org/10.1515/hf-2021-0122.

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Abstract In order to explore the extractives of conifers an effective and environmentally friendly method of extraction with aqueous-alkaline solution allowing to isolate up to 10.4% of extractive substances (ES) from pine wood greenery and up to 6.9% from larch wood greenery was investigated. The component fractional composition of aqueous-alkaline extracts was studied. The antioxidant fraction activity of neutral and acidic components isolated from the produced extracts was evaluated. It was found that these fractions have a high antioxidant activity, where the activity of larch extract comp

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9

Staun, Chris, Neetu Bansal, and James Vaughan. "Electrocrystallization and solubility of mercury in alkaline solution." Canadian Journal of Chemistry 96, no. 4 (2018): 385–93. http://dx.doi.org/10.1139/cjc-2017-0592.

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The chemical thermodynamics of mercury in aqueous sodium hydroxide solution has been investigated through electrochemical polarisation and solubility experiments. A review of thermodynamic data allowed determination of the Hg/HgO electrode potential. Cyclic voltammetry revealed a complex anodic reaction beginning with aqueous dissolution of elemental mercury and subsequent electrocrystallization of mercuric oxide. Cathodic sweeps showed dual reduction reactions, attributed to the presence of aqueous mercury and mercuric oxide. The solubility and hence activity of elemental mercury in sodium hy

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10

Liu, Qi Feng, Qi Wang, and Shao Hui Yan. "Modification of PVDF Membranes by Alkaline Treatment." Applied Mechanics and Materials 316-317 (April 2013): 1033–36. http://dx.doi.org/10.4028/www.scientific.net/amm.316-317.1033.

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Poly(vinylidene fluoride) (PVDF) powder was treated with aqueous sodium hydroxide to obtain partially defluorinated fluoropolymers with expected properties such as improved hydrophilicity and fouling resistance (used as membrane material). The effects of concentration of aqueous sodium hydroxide were investigated. The results showed that the membrane’s hydrophilicity increased with increase of the fraction of alkaline treated PVDF powder. The fouling potential also decreased with the increase of the fraction of alkaline treated PVDF powder.

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11

Haginaka, Jun, and Junko Wakai. "Epimerization of benzylpenicilloate in alkaline aqueous solutions." CHEMICAL & PHARMACEUTICAL BULLETIN 33, no. 6 (1985): 2605–8. http://dx.doi.org/10.1248/cpb.33.2605.

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12

Liu, Jilei, Jin Wang, Zhiliang Ku, et al. "Aqueous Rechargeable Alkaline CoxNi2–xS2/TiO2 Battery." ACS Nano 10, no. 1 (2015): 1007–16. http://dx.doi.org/10.1021/acsnano.5b06275.

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13

Minkina, V. G., S. I. Shabunya, V. I. Kalinin, and V. V. Martynenko. "Stability of aqueous-alkaline sodium borohydride formulations." Russian Journal of Applied Chemistry 81, no. 3 (2008): 380–85. http://dx.doi.org/10.1134/s1070427208030051.

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14

Ragheb, A. A., I. Abdel-Thalouth, and S. Tawfik. "Gelatinization of Starch in Aqueous Alkaline Solutions." Starch - Stärke 47, no. 9 (1995): 338–45. http://dx.doi.org/10.1002/star.19950470904.

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15

Meliashchenia, A., T. Savelyeva, and I. Kaltovich. "COMPARATIVE ANALYSIS OF INFLUENCE OF DIFFERENT METHODS OF TECHNOLOGICAL PREPARATION OF COLLAGEN-CONTAINING RAW MATERIAL ON ITS QUALITY INDICATORS." Topical issues of processing of meat and milk raw materials, no. 15 (December 21, 2021): 207–21. http://dx.doi.org/10.47612/2220-8755-2020-15-207-221.

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The article presents the results of research on the comparative analysis of the influence of various methods of technological preparation of collagen-containing raw materials on its quality indicators. It was established that the preliminary preparation of collagen-containing raw materials allows increasing the amino acid grades of essential amino acids: isoleucine (up to 70.0-92.5%), leucine (up to 68.6-100.0%), phenylalanine and tyrosine (up to 60.0-75.0%) - acid, alkaline, enzymatic hydrolysis, hydrolysis in aqueous medium, fermentation with bacteria of the genus Lactobacacus methionine and

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16

Liu, Qi Feng. "Preparation and Characterization of PVDF/Alkali-Treated PVDF Blend Membranes." Advanced Materials Research 518-523 (May 2012): 768–71. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.768.

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Poly(vinylidene fluoride) (PVDF) powder was treated with aqueous sodium hydroxide to obtain partially defluorinated fluoropolymers with expected properties such as improved hydrophilicity and fouling resistance (used as membrane material). The effects of concentration of aqueous sodium hydroxide were investigated. The results showed that the membrane’s hydrophilicity increased with increase of the fraction of alkaline treated PVDF powder. The fouling potential also decreased with the increase of the fraction of alkaline treated PVDF powder.

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17

Gupta, Priyanka. "Allelopathic Effect of Extracts of Medicinal Plants on Mungbean in Vivo Conditions." Current Agriculture Research Journal 4, no. 1 (2016): 120–24. http://dx.doi.org/10.12944/carj.4.1.14.

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The experiments were conducted at Chaudhary Sarwan Kumar Krishi Vishavidhyalaya,Palampur, Himachal Pradesh, India to see the allelopathic effect of medicinal leaf extracts of Ocimum sanctum L., Calotropis procera(Ait.) Ait.f and Astragalus tribuloides Delile on the plumule length of mungbean (Vigna radiata L. Wilczek) in vivo conditions. The results indicated that different extracts such as alcoholic,aqueous acidic and alkaline extract of Ocimum sanctum L., Calotropis procera(Ait.) Ait.f and Astragalus tribuloides Delile showed different plumule length of mungbean in vivo conditions. All the e

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18

Jamshed, Nausheen, Iffat Raza, Aqiba Rasheed, Naureen Jamshed, Lubna Akhtar, and Nadia Rashid. "Impact of Aqueous Neem Leave Extract on Erythromycin Induced Hepatotoxicity." Pakistan Armed Forces Medical Journal 72, no. 1 (2022): 235–39. http://dx.doi.org/10.51253/pafmj.v72i1.6756.

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Objective: To examine the protective effect of aqueous neem leaves extract against damage induced by erythromycin on liver enzyme alkaline phosphatase. Study Design: Laboratory-based experimental study. Place and Duration of Study: Anatomy Department, Baqai Medical University, Karachi Pakistan, from Mar to Jun 2018. Methodology: Eighty male albino wistar rats were taken and were divided randomly into 4 groups. Group-A served as a control group with no drug given. Group-B animals received the drug erythromycin 100 mg/kg body weight orally through gastric lavage. Group-C animal

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19

Weidlich, Tomáš, Barbora Kamenická, Klára Melánová, Veronika Čičmancová, Alena Komersová, and Jiří Čermák. "Hydrodechlorination of Different Chloroaromatic Compounds at Room Temperature and Ambient Pressure—Differences in Reactivity of Cu- and Ni-Based Al Alloys in an Alkaline Aqueous Solution." Catalysts 10, no. 9 (2020): 994. http://dx.doi.org/10.3390/catal10090994.

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It is well known that the hydrodechlorination (HDC) of chlorinated aromatic contaminants in aqueous effluents enables a significant increase in biodegradability. HDC consumes a low quantity of reactants producing corresponding non-chlorinated and much more biodegradable organic compounds. Two commonly used precious metals free Al alloys (Raney Al-Ni and Devarda’s Al-Cu-Zn) were compared in reductive action in an alkaline aqueous solution. Raney Al-Ni alloy was examined as a universal and extremely effective HDC agent in a diluted aqueous NaOH solution. The robustness of Raney Al-Ni activity is

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20

Fuller, MW, KMF Lebrocq, E. Leslie, and IR Wilson. "The Photolysis of Aqueous-Solutions of Potassium Hexacyanoferrate(III)." Australian Journal of Chemistry 39, no. 9 (1986): 1411. http://dx.doi.org/10.1071/ch9861411.

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The photolysis of aqueous solutions of potassium hexacyanoferrate(III) at 254 and 366 nm forms aqua- or hydroxo-pentacyanoferrate(III) in both acidic and alkaline solutions, with quantum yields between 0.02 and 0.06. Subsequent thermal reactions form the decacyanodiferrate(III) and/or decacyanodiferrate(III,II) species, especially in weakly acidic solutions, and, in alkaline solutions, may precipitate hydrated iron(III) oxides.

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21

Cloutier, Caroline R., Akram Alfantazi, and Elod Gyenge. "Physicochemical Properties of Alkaline Aqueous Sodium Metaborate Solutions." Journal of Fuel Cell Science and Technology 4, no. 1 (2006): 88–98. http://dx.doi.org/10.1115/1.2393310.

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Background: The transition to a hydrogen fuel economy is hindered by the lack of a practical storage method and concerns associated with its safe handling. Chemical hydrides have the potential to address these concerns. Sodium borohydride (sodium tetrahydroborate, NaBH4), is the most attractive chemical hydride for H2 generation and storage in automotive fuel cell applications, but recycling from sodium metaborate (NaBO2), is difficult and costly. An electrochemical regeneration process could represent an economically feasible and environmentally friendly solution. Method of Approach: We repor

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22

Guo, Ke, Shaoyan Wang, Renfeng Song, and Zhiqiang Zhang. "Leaching Titaniferous Magnetite Concentrate by Alkaline Aqueous Solution." Mining, Metallurgy & Exploration 38, no. 4 (2021): 1721–30. http://dx.doi.org/10.1007/s42461-021-00387-x.

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AbstractLeaching titaniferous magnetite concentrate with alkali solution of high concentration under high temperature and high pressure was utilized to improve the grade of iron in iron concentrate and the grade of TiO2 in titanium tailings. The titaniferous magnetite concentrate in use contained 12.67% TiO2 and 54.01% Fe. The thermodynamics of the possible reactions and the kinetics of leaching process were analyzed. It was found that decomposing FeTiO3 with NaOH aqueous solution could be carried out spontaneously and the reaction rate was mainly controlled by internal diffusion. The effects

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23

Mamyrbekova, Aigul, A. D. Mamitova, and Aizhan Mamyrbekova. "Electrochemical Behavior of Sulfur in Aqueous Alkaline Solutions." Russian Journal of Physical Chemistry A 92, no. 3 (2018): 582–86. http://dx.doi.org/10.1134/s0036024418030184.

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24

Duteanu, Narcis, Mircea Dan, Andrea Kellenberger, and Nicolae Vaszilcsin. "VOLTAMMETRIC STUDIES OF YBaCo2O5 IN ALKALINE AQUEOUS SOLUTION." Environmental Engineering and Management Journal 17, no. 12 (2018): 2807–14. http://dx.doi.org/10.30638/eemj.2018.280.

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25

Zubkov, Fedor I., Inga K. Airiyan, Julya D. Ershova, et al. "Aromatization of IMDAF adducts in aqueous alkaline media." RSC Advances 2, no. 10 (2012): 4103. http://dx.doi.org/10.1039/c2ra20295f.

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26

Arterburn, Jeffrey B., Madhavi Pannala, Anicele M. Gonzalez, and Rebecca M. Chamberlin. "Palladium-catalyzed transfer hydrogenation in alkaline aqueous medium." Tetrahedron Letters 41, no. 41 (2000): 7847–49. http://dx.doi.org/10.1016/s0040-4039(00)01365-4.

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27

Jalilehvand, Farideh, Bonnie O. Leung, Maryam Izadifard, and Emiliana Damian. "Mercury(II) Cysteine Complexes in Alkaline Aqueous Solution." Inorganic Chemistry 45, no. 1 (2006): 66–73. http://dx.doi.org/10.1021/ic0508932.

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28

Minkina, Valentina G., Stanislav I. Shabunya, Vladimir I. Kalinin, Vladimir V. Martynenko, and Alevtina L. Smirnova. "Stability of alkaline aqueous solutions of sodium borohydride." International Journal of Hydrogen Energy 37, no. 4 (2012): 3313–18. http://dx.doi.org/10.1016/j.ijhydene.2011.10.068.

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29

Ma, Li-Hua, Zhen-Chang Wen, Li-Rong Lin, and Yun-Bao Jiang. "Dual fluorescence of naphthylamines in alkaline aqueous solution." Chemical Physics Letters 346, no. 5-6 (2001): 423–29. http://dx.doi.org/10.1016/s0009-2614(01)00973-3.

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30

Karatani, Hajime, and Takahiro Shizuki. "Luminescent electrooxidation of methanol in aqueous alkaline media." Electrochimica Acta 41, no. 10 (1996): 1667–75. http://dx.doi.org/10.1016/0013-4686(95)00421-1.

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31

ASANUMA, Noriko, Hiroshi TOMIYASU, Masayuki HARADA, Yasuhisa IKEDA, and Shinichi HASEGAWA. "Anodic Dissolution of UO2 in Aqueous Alkaline Solutions." Journal of Nuclear Science and Technology 37, no. 5 (2000): 486–88. http://dx.doi.org/10.1080/18811248.2000.9714921.

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32

Kalkar, C. D., and N. L. Lala. "Lyoluminescence of luminol in aqueous alkaline metal hydroxides." Journal of Radioanalytical and Nuclear Chemistry Letters 166, no. 6 (1992): 451–64. http://dx.doi.org/10.1007/bf02163528.

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33

Dan, Mircea, Valerie Pralong, Nicolae Vaszilcsin, Andrea Kellenberger, and Narcis Duteanu. "Electrochemical behaviour of YBaCo4O7 in alkaline aqueous solution." Journal of Solid State Electrochemistry 15, no. 6 (2010): 1227–33. http://dx.doi.org/10.1007/s10008-010-1189-3.

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34

Berning, D. E., N. C. Schroeder, and R. M. Chamberlin. "The autoreduction of pertechnetate in aqueous, alkaline solutions." Journal of Radioanalytical and Nuclear Chemistry 263, no. 3 (2005): 613–18. http://dx.doi.org/10.1007/s10967-005-0632-x.

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35

Kitamura, Shinichi, Takashi Hirano, Kenichi Takeo, et al. "Conformational transitions of schizophyllan in aqueous alkaline solution." Biopolymers 39, no. 3 (1998): 407–16. http://dx.doi.org/10.1002/(sici)1097-0282(199609)39:3<407::aid-bip12>3.0.co;2-8.

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36

Rosso, Janina A., M�nica C. Gonzalez, and Daniel O. M�rtire. "Photolysis of polyphosphate ions in alkaline aqueous solution." International Journal of Chemical Kinetics 32, no. 2 (2000): 111–17. http://dx.doi.org/10.1002/(sici)1097-4601(2000)32:2<111::aid-kin7>3.0.co;2-2.

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37

Cheng, Wen-Hsi, and Ming-Shean Chou. "Optimization of Gas-Water Absorption Equilibrium of Carbon Dioxide for Algae Liquors: Selection of Alkaline Buffering Chemicals." International Journal of Photoenergy 2016 (2016): 1–5. http://dx.doi.org/10.1155/2016/2562638.

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The apparent Henry’s Law constant (H′), which quantifies the concentration partition of a gas-liquid equilibrium of carbon dioxide (CO2), is used to optimize the absorption of carbon dioxide in algae liquors. The values ofH′were examined under various conditions: in water at different temperatures (27 and 37°C), in alkaline buffering chemicals (sodium hydroxide (NaOH) and sodium carbonate (Na2CO3)), and in aquatic algae plants (Egeria densaandAnubias barteri nana). The optimal conditions for CO2absorption can be obtained by controlling the aqueous pH values (around weak alkalinity with pH 9-10

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38

Hashim, Sharifah Nurul Ain Syed, Sarani Zakaria, Chin Hua Chia, and Sharifah Nabihah Syed Jaafar. "Enhanced Thermal Stability of Esterified Lignin in Different Solvent Mediums." Polymers from Renewable Resources 9, no. 1 (2018): 39–49. http://dx.doi.org/10.1177/204124791800900103.

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In this study, soda alkali lignin from oil palm empty fruit bunch (EFB-AL) and kenaf core (KC-AL) are esterified with maleic anhydride under two different conditions, namely i) pyridine at temperature of 120°C for 3h and ii) aqueous alkaline solution at room temperature for 4h. As a result, the weight percentage gain (WPG) of the esterified EFB-AL (EFB-EL) and esterified KC-AL (KC-EL) in pyridine demonstrated a higher compared to aqueous alkaline solution. The FT-IR results of EFB-EL and KC-EL in both solvents exhibited some changes at the carbonyl and hydroxyl groups. Furthermore, the esterif

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39

B., S. Moodithaya, and Thimme Gowda B. "Kinetics of chlorination of phenol and monosubstituted phenols by t-butyl hypochlorite in aqueous alkaline medium." Journal of Indian Chemical Society Vol. 79, May 2002 (2002): 420–25. https://doi.org/10.5281/zenodo.5842896.

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Department of Post-Graduate Studies and Research in Chemistry, Managalore University, Mangalagangothri-574 199, India <em>E-mail</em> : gowdabt@yahoo.com <em>Fax </em>: 91-824-742367 <em>Manuscript received 22 March 2001, revised 18 July 2001, accepted 5 November 2001</em> The kinetics of chlorination of the parent and sixteen monosubstituted phenols (2-chloro, 2-methyl, 2-carboxy, 2-nitro, 3- chloro, 3-methyl, 3-carboxy, 4-fluoro, 4-chloro, 4-bromo, 4-methyl, 4-ethyl, 4-methoxy, 4-carboxy, 4-acetyl and 4-nitro) by 1- BuOCI have been studied in aqueous alkaline medium. The rates of reactions s

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40

Bobeničová, Miroslava, Andrea Čaklóšová, and Dana Dvoranová. "The photodegradation of model quinolone carboxylates in aqueous media." Acta Chimica Slovaca 7, no. 1 (2014): 1–8. http://dx.doi.org/10.2478/acs-2014-0001.

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Abstract This work was focused on the study of photoinduced processes of quinolone carboxylates in the presence of titanium dioxide in an alkaline media. UVA irradiation without/with titanium dioxide caused the decomposition of molecules, with higher efficiency of degradation in the presence of titanium dioxide. EPR spin trapping experiments proved that investigated quinolone carboxylates behave as the efficient scavengers of hydroxyl radicals produced upon irradiation of aerated alkaline titanium dioxide systems.

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41

Kakiuchi, Masahisa. "Hydrogen Isotope Fractionation in Aqueous Alkaline Earth Chloride Solutions." Zeitschrift für Naturforschung A 62, no. 12 (2007): 721–28. http://dx.doi.org/10.1515/zna-2007-1208.

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The D/H ratio of hydrogen gas in equilibrium with aqueous alkaline earth (Mg, Ca, Sr or Ba) chloride solutions measured at 25◦C using a hydrophobic platinum catalyst, was found to be higher than the D/H ratio equilibrated with the applied pure water. The hydrogen isotope effect between such solutions and pure water changes with the molality of the solutions. The order of the D/H ratios in alkaline earth chlorides is found to be BaCl2 > SrCl2 ≥ CaCl2 ≥ MgCl2. The hydrogen isotope effect in the aqueous chloride solutions of Mg, Ca, Sr or Ba ions is significantly larger than that in the aqueou

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42

Kim, Eung-Dab, Young-Sik Cho, and Young-Duk Huh. "Facet-controlled synthesis and morphological evolution of Cu₂O microcrystals." CrystEngComm 24, no. 16 (2022): 3014–19. http://dx.doi.org/10.1039/d2ce00304j.

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43

Ayoub, Muhammad, Abrar Inayat, Sintayehu Mekuria Hailegiorgis, and Aamir Hussain Bhat. "Synthesis of Alumina Based Alkaline Catalyst for Biodiesel-Derived Glycerol to Polyglycerol." Advanced Materials Research 1133 (January 2016): 33–37. http://dx.doi.org/10.4028/www.scientific.net/amr.1133.33.

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Biodiesel which comes from pure renewable resources provide an alternative fuel option for future. The rapid growth of the biodiesel industry will result in overproduction of less value glycerol and create a superfluity of this impure by-product. The synthesis of alkaline alumina catalyst for polyglycerol production via solvent free base-catalyzed etherification of low value glycerol is reported. The etherification of biodiesel derived glycerol to polyglycerol was studied in a heterogeneous catalysis under solvent free system, using alkalines over γ – alumina catalysts. All the catalysts were

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44

Durena, Ramona, and Anzelms Zukuls. "A Short Review: Comparison of Zinc–Manganese Dioxide Batteries with Different pH Aqueous Electrolytes." Batteries 9, no. 6 (2023): 311. http://dx.doi.org/10.3390/batteries9060311.

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As the world moves towards sustainable and renewable energy sources, there is a need for reliable energy storage systems. A good candidate for such an application could be to improve secondary aqueous zinc–manganese dioxide (Zn-MnO2) batteries. For this reason, different aqueous Zn-MnO2 battery technologies are discussed in this short review, focusing on how electrolytes with different pH affect the battery. Improvements and achievements in alkaline aqueous Zn-MnO2 batteries the recent years have been briefly reviewed. Additionally, mild to acidic aqueous electrolyte employment in Zn-MnO2 batt

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45

Gulkhan, Genjemuratova, and Jumabayeva Janna Mahmud kizi. "THE DISSOLUTION OF ANTIMONY OXIDES, AND LEAD AND OTHER RELATED METALS IN ALKALINE-AQUEOUS ORGANIC SOLUTIONS." International Journal of Pedagogics 03, no. 06 (2023): 35–38. http://dx.doi.org/10.37547/ijp/volume03issue06-10.

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Metal oxides such as antimony oxide and lead oxide can be dissolved in alkaline-aqueous organic solutions through various methods, including acid-base reactions, complexation, ion exchange, and redox reactions. These methods involve manipulating factors such as pH, temperature, type of solvent, concentration of metal oxide, and presence of other ions. By dissolving metal oxides, they can be extracted from various materials.

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Machado, Tatiane Winkler Marques, Jenifer Mota Rodrigues, Tatiana Rojo Moro, Maria Eugênia Rabello Duarte, and Miguel Daniel Noseda. "Marine Microalgae Biomolecules and Their Adhesion Capacity to Salmonella enterica sv. Typhimurium." Applied Sciences 10, no. 7 (2020): 2239. http://dx.doi.org/10.3390/app10072239.

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Different molecules have been tested as analog receptors due to their capacity to bind bacteria and prevent cell adhesion. By using in vitro assays, the present study characterized the aqueous and alkaline extracts from microalgae Pavlova lutheri and Pavlova gyrans and evaluated the capacity of these extracts to adhere to enterobacteria (Salmonella Typhimurium). The aqueous and alkaline extracts of both species were fractionated via freeze-thawing, giving rise to soluble and insoluble (precipitate) fractions in cold water. The obtained fractions were studied using thermogravimetric, methylatio

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Ishidi, E. Y., I. K. Adamu, E. G. Kolawale, K. O. Sunmonu, and M. K. Yakubu. "Flammability and Thermal Characteristics of Alkaline Aqueous Solution Treated Groundnut Shell–HDPE Composites." Journal of Thermoplastic Composite Materials 24, no. 6 (2011): 875–88. http://dx.doi.org/10.1177/0892705711409550.

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The influence of alkaline aqueous solution treatment of groundnut shell–high density polyethylene composites consist of magnesium hydroxide as flame-retardant additives was investigated. FTT daul cone calorimetry and Perkin-Elmer Diamond differential scanning calorimetry (DSC) were used to characterize flammability and thermal properties of the fabricated composites. Quanta 200ESEM was used to investigate the effect of alkaline aqueous solution treatment on the microstructure of the composites. The result obtained revealed that the alkaline treatment of the shell enhanced filler–matrix compati

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Kamdi, Zakiah, and K. T. Voisey. "Corrosion Mechanism of Tungsten Carbide-Based Coatings in Different Aqueous Media." Key Engineering Materials 694 (May 2016): 167–71. http://dx.doi.org/10.4028/www.scientific.net/kem.694.167.

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In cermet coatings with both ceramic and metal present, these can have very different corrosion potentials. Therefore, determination of the corrosion behaviour performance and its mechanism is crucial, especially in very acidic and alkaline environment. A conventional high velocity oxy-fuel (HVOF) tungsten carbide (WC)-Co coatings and a weld overlay tungsten carbide-nickel alloy cermet with carbide size of ~0.3-5 mm and ~50-140 mm respectively are used. Potentiodynamic tests are carried out in acidic and alkaline electrolytes: 0.5 M sulphuric acid, pH 0.45 and bentonite drilling fluid, pH 10.4

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Oyelakin, Oladele, Moumouny Traoré, El Hadji Babacar Mbaye, et al. "Spectrofluorometric Determination of Putrescine Using Orthophthaldehyde as a Fluorophore: A Novel Method." Journal of AOAC INTERNATIONAL 99, no. 1 (2016): 170–73. http://dx.doi.org/10.5740/jaoacint.15-0212.

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Abstract This paper concerns spectrofluorometric analysis of putrescine using orthophthaladehyde as a fluorophore in aqueous alkaline medium. Wavelengths of excitation and emission in acid, neutral, and alkaline media were different. There is a maximum intensity of fluorescence in alkaline medium 24 h after complexation compared with other media. Putrescine and orthophthaladehyde are used at an equimolar ratio, and the product is kinetically stable in alkaline medium. Calibration curves obtained gave limits of detection and quantification of 39 and 65 ng/mL, respectively. The correlation coeff

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Ügdüler, Sibel, Kevin M. Van Geem, Ruben Denolf, et al. "Towards closed-loop recycling of multilayer and coloured PET plastic waste by alkaline hydrolysis." Green Chemistry 22, no. 16 (2020): 5376–94. http://dx.doi.org/10.1039/d0gc00894j.

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